Shop › American Ridgid Scaffold Clamp (Cheeseborough) Image 1 of 1 American Ridgid Scaffold Clamp (Cheeseborough) Sale Price: $44.99 Original Price: $48.00 Part No: ME139R Used for mounting a light, or other grip equipment, at a right (90°) angle to a grip pipe, or truss. Also used to connect truss or grid pipes together at right (90°) angles.